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+Math::Symbolic::Custom::Transformation is an extension to the 
+Math::Symbolic module. You're assumed to be remotely familiar with that 
+module throughout the documentation.
+
+This package implements transformations of Math::Symbolic trees using 
+Math::Symbolic trees. I'll try to explain what this means in the following 
+paragraphs.
+
+Until now, in order to be able to inspect a Math::Symbolic tree, one had 
+to use the low-level Math::Symbolic interface like comparing the top 
+node's term type with a constant (such as T_OPERATOR) and then its 
+operator type with more constants. This has changed with the release of 
+Math::Symbolic::Custom::Pattern.
+
+To modify the tree, you had to use equally low-level or even 
+encapsulation-breaking methods. This is meant to be changed by this 
+distribution.
+
+WWW: http://search.cpan.org/dist/Math-Symbolic-Custom-Transformation
+Author: Steffen Mueller <symbolic-module@steffen-mueller.net>